Would you recommend the product DRYLOK to stop water leaking through cinder block basement walls in heavy rain storms
No and maybe. Here’s why. If your basement walls leak after a heavy rain, DRYLOK is only a very small part of the solution.
Basements that leak after with heavy rain (or even melting snow) do so because their roof and surface drainage is not working. For example, clogged gutters, gutters that discharge too close to the house, gutters that are undersized, grading around the foundation being too flat, and a host of other conditions we outline in this post – need to be fixed first!
Once that happens, the very last step could be to apply a water-proofing paint like DRYLOK, not to stop the leak, but to reduce the transfer of moisture to the basement resulting in high humidity.
No matter how many coats of paint you put on your walls, the house won’t float and water will find a way in! Fix your drainage problems first and most if not all of your leaks will go away, event without using DRYLOK.